Pass camera facing to WebKit

media/capture/video/linux/video_capture_device_factory_linux.cc

Index: media/capture/video/linux/video_capture_device_factory_linux.cc
diff --git a/media/capture/video/linux/video_capture_device_factory_linux.cc b/media/capture/video/linux/video_capture_device_factory_linux.cc
index abe433706718f047473a27d28e46c72a93d7887b..14a1ca12e6b4c5679e1ed4efd5fc3df4b9aae3a2 100644
--- a/media/capture/video/linux/video_capture_device_factory_linux.cc
+++ b/media/capture/video/linux/video_capture_device_factory_linux.cc
@@ -22,12 +22,22 @@
 #endif
 
 #if defined(OS_CHROMEOS)
+#include "base/lazy_instance.h"
+#include "media/capture/video/linux/camera_facing_chromeos.h"
 #include "media/capture/video/linux/video_capture_device_chromeos.h"
 #endif
 #include "media/capture/video/linux/video_capture_device_linux.h"
 
 namespace media {
 
+namespace {
+
+#if defined(OS_CHROMEOS)
+base::LazyInstance<media::CameraFacingChromeOS>::Leaky g_camera_facing_helper =
+    LAZY_INSTANCE_INITIALIZER;
+#endif
+}
+
 // USB VID and PID are both 4 bytes long.
 static const size_t kVidPidSize = 4;
 
@@ -205,9 +215,17 @@ void VideoCaptureDeviceFactoryLinux::GetDeviceDescriptors(
          !(cap.capabilities & V4L2_CAP_VIDEO_OUTPUT)) &&
         HasUsableFormats(fd.get(), cap.capabilities)) {
       const std::string model_id = GetDeviceModelId(unique_id);
+#if defined(OS_CHROMEOS)
+      device_descriptors->emplace_back(
+          reinterpret_cast<char*>(cap.card), unique_id, model_id,
+          VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE,
+          VideoCaptureTransportType::OTHER_TRANSPORT,
+          g_camera_facing_helper.Get().GetCameraFacing(unique_id, model_id));
+#else
       device_descriptors->emplace_back(
           reinterpret_cast<char*>(cap.card), unique_id, model_id,
           VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE);
+#endif
     }
   }
 }